A search plane has detected another possible ping that could be from the Malaysia Airlines Flight 370's black boxes.
The signal was picked up by aÂ sonobuoy dropped into the ocean from the plane.
CNN's David Mattingly reports on how crucial these sonobuoys are to the search.
Sources tell CNN Malaysia Airlines Flight 370's Captain Zaharie Ahmad Shah was the last person on the jet to speak to air-traffic controllers, saying "Good night, Malaysian three-seven-zero."
In interview with CNN's Erin Burnett, Sivarasa Rasiah, the vice President of the Malaysian opposition party and a member of Parliament, speaks about his friendship with Shah and shares new images of the captain.
Sources tell CNN it appears that Malaysia Airlines Flight 370 disappeared from military radar for about 120 nautical miles.
According to a senior official with the Malaysian government, the absence from radar means it likely dipped below an altitude of 5,000 feet.
What would have caused the drop in altitude? And how dramatic of a drop would it be for the plane to make?
CNN's Martin Savidge is in the flight simulator to demonstrate how an altitude drop would play out.
Investigators got new information that may help them narrow the search for Malaysia Airlines Flight 370 on Thursday - Australian officials announced that a search plane has detected a possible signal - the fifth so far - from the locator beacons from the missing jet's so-called black boxes.
If the signals that are being detected are the missing aircraft - with the investigation entering its 35th day - how long until the batteries of the black box pingers go dead?
OutFront, CNN's Richard Quest and Anish Patel, president of Dukane-Seacom, the largest manufacturer of black box pingers. Authorities confirm at least one of his pingers was on board flight 370.
The search area for missing Malaysian Airlines Flight 370 has narrowed dramatically - shrinking by 7 thousand square miles.
A search plane has detected a possible signal - the fifth so far - from the locator beacons from the missing jet's so-called black boxes, the Australian agency coordinating the search announced.
Officials say each new signal is helping them zero in on the once sprawling search area.
CNN's Tom Foreman explains how signals are helping to narrow down the search area for Flight 370.